Improve examples

tshemsedinov · tshemsedinov · commit bb6ef84fff93 · 2017-09-12T00:25:44.000+03:00
diff --git a/JavaScript/3-scalar.js b/JavaScript/3-scalar.js
@@ -1,14 +1,14 @@
 'use strict';
 
 const scalar = 5;
-const object1 = { scalar };
+const object1 = { field: scalar };
 const object2 = object1;
 
 console.dir({ object1 });
 console.dir({ object2 });
 console.dir({ scalar });
 
-object1.scalar = 6;
+object1.field = 6;
 
 console.dir({ object1 });
 console.dir({ object2 });
diff --git a/JavaScript/4-types.js b/JavaScript/4-types.js
@@ -17,6 +17,10 @@ o.city = 'Odessa';
 const a = ['Athens', 'Roma', 'London', 'Beijing', 'Kiev', 'Riga'];
 
 a.push('Odessa');
+a.unshift('New York');
+
+console.log('shifted:' + a.shift());
+console.log('pop: ' + a.pop());
 
 console.log({ i }, typeof(i));
 console.log({ s }, typeof(s));
diff --git a/JavaScript/5-undefined-null-NaN.js b/JavaScript/5-undefined-null-NaN.js
@@ -7,7 +7,7 @@ console.log({ u }, typeof(u));
 
 // null
 
-let o = null;
+const o = null;
 console.log({ o }, typeof(o));
 
 // NaN
@@ -16,6 +16,9 @@ let n = NaN;
 console.log({ n }, typeof(n));
 
 n = undefined + 1;
-console.log({ n }, typeof(n));
+console.log(n);
 
 console.log(Infinity, -Infinity, typeof(Infinity));
+
+const s = o === null ? 'o is null' : 'o is not null';
+console.log(s);
